I had a really hard time _____studying science this term.
—The book store ________ a big sale. The books there must be very cheap now.—Sounds great. Let’s go into it and have a look.
—The song Where did the time go ________ the old days and the love of family.—Sure. It’s my favorite song.
—Mom, must I take out the trash now?—No, you ________. You may take a rest first.
—Smart phones are more and more popular now.—So they are. But they still ________ too much.
It’s very friendly ________ him to help me when I’m in trouble.