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global class YQLBridge {

    @future (callout=true)
    public static void searchGoogleBooks(String bookId) {
        Book__c book = [SELECT Name, Id FROM Book__c WHERE Id=:bookId];
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        req.setEndpoint('https://query.yahooapis.com/v1/public/yql?q=SELECT%20*%20FROM%20google.books%20WHERE%20q%3D%22'
            +book.Name+
            '%22%20AND%20maxResults%3D1&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&format=json');

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trigger CreateRenewal on Opportunity (after insert, after update) {
	List<Opportunity> renewals = new List<Opportunity>();
	List<Opportunity> closedOpp = Trigger.new;
	RecordType renewalRecordType = [SELECT Id FROM RecordType WHERE Name LIKE '%Renewal%'];

	for(Opportunity opp: closedOpp){
		if(opp.IsClosed){
			Opportunity newOpp = new Opportunity();
			newOpp.AccountId = opp.AccountId;
			newOpp.Name = opp.Name+'Renewal';

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Still new to Salesforce? First read some these good workbooks : https://wiki.developerforce.com/page/Force.com_workbook
Watch some Salesforce training videos : https://www.youtube.com/playlist?list=PL6747B4DAE356E17C
This tips is also good to read : 
http://agilecloudconsulting.blogspot.jp/2013/10/how-to-become-certified-salesforcecom.html
http://salesforce-certification-notes.blogspot.jp/?view=magazine
Ready to go? Take some exam questions practice : 
http://bulkified.com/Certifications/?certificationId=1
http://www.abetterstudyguide.com/ABSG/
And the last read carefully the study guide : http://certification.salesforce.com/SG_CertifiedAdministrator.pdf
If you still don't have a confidence, study more.

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<apex:selectList value="{!item}" size="1"> <!-- must have declared it with size=1 in order to become dropdown list -->
  <apex:selectOptions value="{!itemList}"/> <!-- for detail see OptionController.cls.cls file -->
</apex:selectList>

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public class OptionController {
    public List<CustomObject__c> ListOfItems {get;set;}
    
    public List<SelectOption> getItems() {
        List<SelectOption> options = new List<SelectOption>();
        for(CustomObject__c sObj: ListOfItems) {
            options.add(new SelectOption(sObj.Id, sObj.Name));
        }
        return options;
    }

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<select id="test">
    <option id="test1">test1</option>
    <option id="test2">test2</option>
    <option id="test3">test3</option>
    <option id="test4">test4</option>
    <option id="test5">test5</option>
</select>

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@implementation NSApplication (Relaunch)

- (void)relaunchAfterDelay:(float)seconds
{
	NSTask *task = [[[NSTask alloc] init] autorelease];
	NSMutableArray *args = [NSMutableArray array];
	[args addObject:@"-c"];
	[args addObject:[NSString stringWithFormat:@"sleep %f; open \"%@\"", seconds, [[NSBundle mainBundle] bundlePath]]];
	[task setLaunchPath:@"/bin/sh"];
	[task setArguments:args];

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- (BOOL) trackMouse:(NSEvent *)event inRect:(NSRect)cellFrame ofView:(NSView *)controlView untilMouseUp:(BOOL)flag
{
    // Check if the button was hit.
    int hitType = [self hitTestForEvent:[NSApp currentEvent] inRect:cellFrame ofView:controlView];
    BOOL isButtonClicked = hitType == (NSCellHitContentArea | NSCellHitTrackableArea);
    if (!isButtonClicked) return YES;
    
    // Ignore events other than mouse down.
    if ([event type] != NSLeftMouseDown) return YES;